The Accurate shooter site is a great source for a lot tips and ideas. I use rod guide's and coated cleaning rod's.
I traded for a Rem 700 in .308 win at a gun show and found out too late the chamber had a bur at the start of the chamber that was pealing a strip of brass when cambering a round, after looking at the chamber with a bore scope it looked like probably a steel cleaning rod had been used with out a rod guide. I was able to remove the bur and the gun shoots fine now.